@chocolatier.ya: when Darun becomes pregnant, Yai’s mother confronts and severely threatens her. She tells Darun that she will completely destroy Darun's family, including the unborn child in her womb, if Darun does not end the relationship and leave her son.
And as a result of this harsh ultimatum, Darun makes the agonizing decision to protect the people she loves by sacrificing her own happiness. To force Yai to leave her and ensure he wouldn't fight for their relationship, she lies and makes him believe that she intentionally had an abortion.
This devastating lie works; it causes Yai to become heartbroken and furious, leading him to walk away from her in agony. This tragic misunderstanding sets the stage for their bitter separation and eventual reunion 14 years later.